Water-tube boiler.



No. 700,09l'.

PatentedMay I3", I902. I E. G. RUST. WATER TUBE BOILER.

(Application filed Nov. 7, 1901.)

3 Sheets- Sheet l.

. (No Model.)

1 mikum m2 Mourns Pzrzne 120., 'momumo" WASNKNG'ION. n. c.

a sheets-s eet 2.

Patented May l3, I902.

E. e. RUST. WATER TUBE BOILER.

(Application med Nov. 7, 1901.)

No. 700,09l.

LNo MG deI.)

No. 700, 09|. v Patented May l3, I902.

E. G. RUST.

WATER TUBE BOILER.

(Application flld Nm}. 7, 19013 "(no Model.)-

UNITED STATES PATENT OFFICE.

EDWIN GRAY RUST, OF PUEBLO, COLORADO.

WATER-TUBE BOILER.

SPECIFICATION forming part of I Letters Patent No. 700,091, dated May13, 1902. Application filed November 7,1901. Serial No. 81,420- (Nomodel.)

To all whom, it nuty'cmwern:

Be it known that I, EDWIN GRAY Rusr, a citizen of the United States,residing in Pueblo, Colorado, have invented certain Improvements inWater-Tube Boilers, of which the following is a specification.

My invention relates to certain improvements in water-tube boilers,having for its object the provision of a boiler which shall not only bean efficient steam-generator, but also of simple and relativelyinexpensive construction.

A further object ofmy invention is to provide a boiler ofthe characterdescribed in which the vertical tubes shall be interchangeable, theconstruction being such that said tubes can be used without beingcurved, it being also desired to provide a boiler in which. thebaffle-walls for directing the course of the products of combustionshall be readily replaceable and at the same time of a construction not"readily burned out.

These objects I attain as hereinafter set forth, reference being had tothe accompanyingdrawings, in Which s Figure 1 is a vertical sectionalview of my improvedboiler, taken through the various drums and thefurnace. Fig. 2 isa vertical sectional view taken on theline 2 2,Fig. 1. Fig. 3is a perspective View of a portion of the" tube-sheet ofone of the drums used in my improved boiler. Fig. 4 is 'a verticalsectional view taken through the tube-sheet shown in Fig. 3 atright'angles to the axis'of the boiler-drum, and Fig. 5 is-a similarview taken through a drum having'four instead of three openings in aseries of the vertical tubes.

In the above drawings, A is the boiler setting or casing, usually ofbrick, supported on suitable foundations a, preferably of concrete, andhaving a forwardly-extending section A, which serves asthe furnace. Theinterior of the brick casing, as well as of the furnace, is providedwith a fire-brick lining a, and the'rear portion of the furnace has aprojecting bridge-walled, carried on the main foundations ofthe boiler,the said furnace being-also provided with the customary fire andaslidoorsa and. a, and any desired form of grate a v Suitably supportedat the lower part of the boiler are three drums B, B, and B and caltubes 1), all of the same length in the present instance. I preferablyplace the upper drums farther apart than the lower ones, the

result of this being that while the dll1Il1-O lS vertically over thedrum l3 and the tubes conmeeting them are vertical the drum 0 is out ofline with the drum B',,thereby causing the tubes connecting these twolatter drums to be slightly inclined. The tubes connecting the drums Band O are thus still further inclined, there being, preferably, no spacebetween the drum B and the bridge-wall a which is generally directlyunder the drum 0. In'order that all of the tubes 61 may enter the drumsnormally to the surface thereof and without curving the tubes, as hasbeen customary, 1 form the tubesheet of said drums, as shown in Fig. 3.For this purpose the sheetafter being curved to the shape of the drum issubjected to the action of a suitable press, and portions of its surfaceI) are pressed out or made to project in the form and arrangement shown.Each of these projecting portions has a flat top surface, and all ofthese flat top surfaces are preferably in the same plane, although theremay be certain constructions which will make it desirable to have saidprojecting portions formed so that they would be in different planes.The holes I) for the tubes are then drilled or punched in this fiatsurface, it being noted that between each of the projecting parts I)there is a curved portion 12 of the drumproper.

Referring to the other figures of drawings, it will be seen that by theconstruction of the tube-sheet therein shown allof the tubes are broughtout normal to the' surface of the boiler and do not require curving.Series of tubes 6 connect the drums B, B, and B respectively, and thereis also a series of slightly-curved tubes 0 extending between the drumsO and ,0. There are'two smaller drums D, supported o verthe drums O andOconnected to them through pipes 01. There are also pipes d,which connectthe said drums Dwith the drum 0. The steam-supply main d is preferablyconnected to the pipes d near the point of junction with the drum D.

It will be seen that the fire-brick lining a extends between the drumsGand 0 directly over the curved tubes c, while the stack E fortheremovalof the products of combustion is supported over and communicateswith the space between the drums C and C the drums D being within thebase of said stack.

There are hollow girders ff, preferably of cast-iron, extending acrossthe interior of the boiler, upon which are supported battle-walls F andF. These walls are built in sections, as shown, certain of the sectionsbeing altogether independent of the others, thus making it possible toremove and replace any desired section without disturbing the others.The baflie-wall F is made with lateral projecting extensions f on itstop portion, the said wall extending in a practically vertical line fromthe point of junction of the tubes 7) with the drum B to within a shortdistance of the drums C and C. The baiiie-wall F, on the other hand,extends from the inner side of the drum 0' vertically downward to withina short distance of the drum B.

In order to cause the products of combustion to circulate in themostefficient manner, there is a lateral projection a extending inwardlyfrom the back wall of the boiler at a point about midway between thelateral projections of the baffle-wall F. In order to easily removeaccumulations of soot and to permit of easy access to the interior ofthe boiler for inspection and repairs, there are a number of doors a inthe sides of the boilercasing. There are also doors a in the rear of thesame. Each of the three lower drums is provided with a separate blow-elfI), each being preferably, but not necessarily, independent of theothers.

It will be seen that products of combustion from the furnace A willenter the lower portion of the boiler and rise around the tubesconnecting the drums B and 0 toward the top thereof, where, strikingupon the bottoms of the drums C and 0, they are deflected downwardbetween the baffle-walls F and F around the tubes connecting the drums Oand B. They then pass under the lower edge of the bafiie-wall F and aredeflected by the lateral projections f, a, and f through and around thetubes connecting the drums B and C finally passing up between the drumsC and C and around the drums D into a stack.

The lateral projections f and f from the baffle-walls aid in promotingthe most effective circulation of the hot gases around the practicallyvertical water-tubes, and it will be understood that by permitting thisstill hot gas to pass out of the boiler around the steam-drums D, I amenabled to obtain steam which is to some extent superheated.

By the arrangement of the baffle-walls built in sections, as shown, I amenabled to very easily and quickly replace any portion of said wallswhich has become burned out or injured from any cause, it being thus acomparatively simple matter to make this class of repairs. It willfurther be noted that the cast-iron girders f are made hollow and opento the atmosphere at their ends, permitting air to circulate and coolthem, thus preventing overheating of said girders and their speedy burn=ing out.

By the peculiar construction of drums above described I am enabled touse watertubes all of one length, and that without curving or bendingthe same. This very desirable result is attained without anyinconvenience of construction, for the tubes are brought out oftheir'respective drums normal to the surface and there is enough spacebetween each series of vertical tubes to'permit of any single tube beingremoved and replaced without disturbing those around it. It will ofcourse be understood that I do not confine myself to the use of any,particular number of tubes in the series at right angles to the axis ofthe drum, as I may use four, as shown in Fig. 5, or any othernumber,depending upon the heating-surface desired.

From Fig. 3 it will be seen that there is a portion of the cylindricalsurface of the drum between each of the pressed-out sections of thetube-sheet, and this construction aids greatly in stiffening the drums,making them very materially stronger than they would be without saidcurved portions between the pressed-out sections.

It will of course be understood that while I show a boiler in which thedrums are made of two sheets riveted together, one of which contains thepressed-out sections 1), I may, if I desire, construct the drums of butasingle sheet, forming the projecting surfaces, as shown in Fig. 3, forthe reception of the watertubes.

I claim as my invention- 1. In a water-tube boiler, the combination of afurnace, upper and lower drums, a number of series of straight tubesconnecting said drums, the latter being constructed with a series ofpressed-out plane surfaces tangent to their curved surface, the samebeing constructed to permit the entrance in the same plane of all thetubes in each series perpendicular to both the interior and exteriorsurface of said pressed-out portions without bending, a stack, means forcausing the products of combustion to circulate around the tubes anddrums as they pass from the furnace to said stack, substantially asdescribed.

2. As a new article of manufacture, a tubesheet for a water-tube boiler,the same having portions of its surface pressed out to form a series ofplane surfaces, each one of said surfaces being tangent to the curve ofthe tube-sheet and having an unaltered curved portion of said tube-sheetbetween it and the pressed-out surface next adjacent, substantially asdescribed.

3. In a water-tube boiler, the combination of a furnace, upper and lowerdrums each having its curved surface pressed out so as to form a numberof successive plane surfaces all in the same plane and separated fromthe plane surface on each side of it by-an unaltered curved section ofthe drum-surface, series of tubes extending between the drums, all thetubes of each series entering a single one of said plane surfaces, astack and means for causing the products of combustion to circulatearound said tubes during their passage from the furnace to the stack,substantially as described.

4. The combination in a Water-tube boiler, of a casing, a series oflower drums, a series of upper drums, straight tubes connecting each ofthe upper drums with one of the lower drums, the vertical baffle-wallsbetween the sets of tubes arranged across the combustionchamber of thestructure, having means whereby they are supported independently of saidtubes and drums, a furnace-section connected with one end of thecombustion-chamber and a stack connected to theother end of the same,substantially as described.

5. As a new article of manufacture, a tubesheet for a water-tube boiler,the same havingportions of its surface pressed out to form a series ofplane surfaces, each one of said surfaces having an unaltered curvedportion of said tube-sheet between it and the pressedout surface nextadjacent, substantially as described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWIN GRAY RUST. Witnesses:

A. H. HOLANDER, J AMES F. CHAPMAN.

